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Trimmer identification / calibration
Trimmer identification / calibration
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Old 31st August 2016, 09:27 PM   #1
yekuku is offline yekuku  Europe
diyAudio Member
 
Join Date: Dec 2006
Default Trimmer identification / calibration

Hi guys, I would appreciate a little help with this one.
I am restoring an TC 2240 Parametric EQ and there is a trimmer at the input with an undocumented function.
Here are the schematics:
Click the image to open in full size.
Does anybody understand its function ?
Any ideas on how to adjust it ?
many thanks
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Old 6th September 2016, 03:47 PM   #2
ej25awd is offline ej25awd  Canada
formally hitachi_nut
 
Join Date: Jan 2007
Looks like the non-inverting gain adjustment when operating in unbalanced mode. How is the unbalanced jack terminated? I'm guessing the inverting input gets connected to ground. If you haven't replaced the feedback components of the first opamp, just leave the trimmer alone.
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